You should use electric fans instead of air conditioners _____ they don’t emit dangerous gases. (A. because B. although C. so D. but)
A. because
Kevin told Phong _____ to our environment in several ways. (A. plastic is too harmful B. plastic was very harmful C. plastic may be very harmful D. plastic had been very harmful)
D. plastic had been very harmful
The campaign _____things like water bottles and aluminum cans into new, useful objects like park benches, bikes, etc. (A. turns B. comes C. becomes D. recycles)
A. turns
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